In physics, mass is an intrinsic positive physical quantity of a body, which measures its resistance to acceleration. In modern physics, it is generally defined as the strength of an object's gravitational attraction to other bodies — as measured by an observer moving along at the same speed.
In physics, mass is an intrinsic positive physical quantity of a body, which measures its resistance to acceleration. In modern physics, it is generally defined as the strength of an object's gravitational attraction to other bodies — as measured by an observer moving along at the same speed.
Source: Wikipedia "Mass" · CC BY-SA 4.0
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